Can nerve impingement at L3 and 4 cause constipation? Opiate pain mess, but no measures, including digital stim and enemas have produced bm. BS + x4

NO. Nerve impingement is not a cause of constipation however opiates certainly can and there is medicine to treat opiate-induced consipation! Best idea however is to get off opiates!!! Ask your Prescriber! Hope this helps! Dr Z.